Biheterocyclic ultraviolet stabilizers and their use in organic compositions

ABSTRACT

The invention relates to biheterocyclic compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of the biheterocyclic composition to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

This invention relates to biheterocyclic ultraviolet stabilizers and their use in organic compositions. More particularly, the invention relates to biheterocyclic compositions and the stabilization of ultraviolet degradable organic compositions against deterioration resulting from the exposure to such radiations with such biheterocyclic compositions.

The degradative effects of ultraviolet light on various organic compositions is well known in the art. The photo-deterioration or degradation is of particular concern with organic photo-degradable compositions which are exposed to ultraviolet light, such as sunlight, for long periods of time. One group of such photo-degradable organic compositions are polymeric compositions such as polyolefins, polyesters, polyurethanes and the like. On exposure to sunlight for extended periods of time, these polymeric compositions degrade and their physical properties are reduced to render the polymeric composition less useful for most applications. Therefore, considerable effort has been directed to providing a solution to the photo-degradation problem of polymeric compositions. As a result of this effort, there have been discovered many additives and stabilizers which improve the stability of polymeric compositions.

Moreover, various additives and stabilizers exhibit the power to absorb ultraviolet radiation within the band of 2900 to 4000 A. and, when incorporated in various plastic materials such as transparent sheets, the resultant sheet acts as a filter for all the radiation passing through and will transmit only such radiations as are not absorbed by the sheet and/or the absorbing agent. It is thus possible to screen out undesirable radiations and utilize the resulting transparent sheet as a filter in many technical and commercial applications, such as wrappings for food products and the like.

While there are many additives, stabilizers and mixtures thereof which are known in the art to improve the ultraviolet light stability of organic compositions, there is a need in the art for more efficient and effective stabilizers to prevent the photo-degradation of organic compositions susceptible to photo-degradation. Therefore, to provide a more effective and efficient ultraviolet stabilizer for organic compositions susceptible to such degradation would be an advance in the state of the art.

It is, therefore, an object of the present invention to provide more effective and efficient ultraviolet light stabilizer compositions.

Another object of the present invention is to provide useful compositions characterized by improved resistance to ultraviolet degradation and deterioration.

It is still another object of the present invention to provide compositions containing biheterocyclic compositions which are resistant to ultraviolet degradation.

It is a still further object of this invention to provide processes for improving the resistance of organic materials to deterioration and degradation by actinic radiation and especially ultraviolet radiation.

It is a still further object of this invention to provide compositions and processes for improving the resistance of organic materials to deterioration and degradation by ultraviolet radiations, including short wave-length visible radiations.

Further objects and advantages of the invention will be apparent to those skilled in the art from the accompanying disclosure and claims.

In accordance with the present invention, biheterocyclic compositions are provided which are useful as ultraviolet stabilizers or ultraviolet screening agents. These organic compositions contain at least one heterocyclic group containing compositions connected to an ortho-alkylated piperidinyl ring. The biheterocyclic compositions of the present invention have the following structure:

    A--B--C

wherein A is a group having the structure ##STR1## wherein X is a carbon atom or a nitrogen atom;

Z is an oxygen atom, a sulfur atom, a nitrogen atom, or a nitrogen atom containing a hydrogen atom or a substituted or unsubstituted lower alkyl group containing 1 to 12 carbon atoms;

R₁, R₂, R₃ and R₄ are hydrogen, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, chloro, bromo, alkoxy, substituted amino, cyano, and the substituents R₁ and R₂, R₂ and R₃, and R₃ and R₄, combined with the carbon atoms to which they are attached, are joined alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R₁, R₂, R₃ and R₄.

The B group is a group connecting A and C and can be alkylene, arylene, carbonyloxy, oxycarbonylalkyleneoxy, alkyleneoxy, oxycarbonyl, alkylenecarbonyloxy, oxycarbonyloxy, oxyalkylene, alkyleneoxyalkyleneoxy, thio, thioalkyleneoxy, sulfinyldioxy, oxy(alkoxy)phosphinooxy, alkyloxyphosphinylidene, aryloxyphosphinylidene, oxy(alkyl)phosphinyloxy, aminocarbonyl, N-alkylaminocarbonyl, N-arylaminocarbonyl, aminocarbonylalkyleneoxy, N-alkylaminocarbonylalkyleneoxy, N-arylaminocarbonylalkyleneoxy, aminocarbonylamino, N-alkylaminocarbonylamino, di(N-alkylamino)carbonyl, N-arylaminocarbonyl, N-alkylaminocarbonyl, di(N-aryl)aminocarbonyl, amino, N-alkylamino, N-arylamino, N-alkylaminoalkyleneoxy, N-arylaminoalkyleneoxy, oxyalkyleneoxy, oxyaryleneoxy, alkyleneaminoalkylene, aryleneaminoarylene, aryleneaminoalkylene and alkyleneaminoarylene.

The C group is a group having the formula ##STR2##

R₅ and R₆ are each alkyl having 1-6 carbons; R₇ and R₈ are each alkyl having 1-6 carbons or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group; and R₉ is hydrogen, oxy, alkyl having 1 to 12 carbon atoms, β-methoxyethyl, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or alkyl substituted benzyl.

Suitable heterocyclic A groups having the structure ##STR3## are, for example substituted and unsubstituted benzoxazoles, benzothiazoles, benzimidazoles, and indoles.

Examples of suitable benzoxazole moieties are those having the formula ##STR4## such as 5,6-dimethyl-2-benzoxazolyl, 2-benzoxazolyl, and 5-chloro-2-benzoxazolyl.

Examples of suitable benzothiazole moieties are those having the formula ##STR5## such as 5,6-dimethyl-2-benzothiazolyl, 2-benzothiazolyl, and 5-chloro-2-benzothiazolyl.

Examples of suitable benzimidazole moieties are those having the formula ##STR6## wherein Q is hydrogen or a substituted or unsubstituted lower alkyl group containing 1 to 12 carbon atoms. Such benzimidazole moieties are, for example, 5,6-dimethyl-2-benzimidazolyl, 2-benzimidazolyl, 5-chloro-2-benzimidazolyl, 1-methyl-2-benzimidazolyl, and 1-ethyl-5-chloro-2-benzimidazolyl.

Examples of suitable indole moieties are those having the formula ##STR7## wherein G is the same as R₁ and Q is hydrogen or a substituted or unsubstituted lower alkyl group containing 1 to 12 carbon atoms. Such suitable indole moieties are, for example, 1-ethyl-3-cyano-2-indolyl, 5-chloro-2-indolyl, 1-methyl-2-indolyl, 3-methyl-2-indolyl, 3-chloro-2-indolyl, 5-acetamido-2-indolyl, 2-indolyl, 1-ethyl-2-indolyl, 3-cyano-2-indolyl, 5-methoxy-2-indolyl, 3-methyl-5-phenyl-2-indolyl, and 3,5-dichloro-2-indolyl.

Suitable B groups are for example alkylene, arylene, carbonyloxy, oxycarbonylalkyleneoxy such as oxycarbonylmethyleneoxy, oxycarbonylethyleneoxy, oxycarbonyl-1,4-butanediyloxy, oxycarbonyl, alkyleneoxycarbonyloxy such as methyleneoxycarbonyloxy, ethyleneoxycarbonyloxy, 1,4-butanediyloxycarbonyloxy, 1,5-pentanediyloxycarbonyloxy, oxycarbonyloxy, alkyleneoxy such as methyleneoxy, ethyleneoxy, 1,3-propanediyloxy and the like, alkyleneoxyalkyleneoxy such as methyleneoxymethyleneoxy, ethyleneoxyethyleneoxy, methyleneoxyethyleneoxy, ethyleneoxymethyleneoxy and the like, oxyalkyleneoxy such as oxymethyleneoxy, oxyethyleneoxy, oxy-1,4-butanediyloxy and the like, thio, thioalkyleneoxy such as thiomethyleneoxy, thioethyleneoxy and the like, sulfinylidoxy, oxy(alkoxy)phosphinooxy such as oxy(methoxy)phosphinooxy, oxy(ethoxy)phosphinooxy, oxy(butoxy)phosphinooxy and the like, alkyloxyphosphinylidene such as methoxyphosphinylidene, butoxyphosphinylidene, and the like, aryloxyphosphinylidene such as phenoxyphosphinylidene, naphthoxyphosphinylidene, 3-methylphenoxyphosphinylidene, and the like, oxy(alkyl)phosphinyloxy such as oxy(methyl)phosphinyloxy, oxy(propyl)phosphinylidene, oxy(hexyl)phosphinylidene and the like, aminocarbonyl, N-alkylaminocarbonyl such as N-methylaminocarbonyl, N-ethylaminocarbonyl, N-butylaminocarbonyl and the like, N-arylaminocarbonyl such as N-phenylaminocarbonyl, N-(3-methylphenyl)aminocarbonyl and the like, aminocarbonylalkyleneoxy such as aminocarbonylmethyleneoxy, aminocarbonyl-1,4-butanediyloxy, N-methylaminocarbonylmethyleneoxy, N-phenylaminocarbonylethyleneoxy and the like, aminocarbonylamino, alkylaminocarbonylamino such as N-methylaminocarbonylamino, N-ethylaminocarbonylamino and the like, di(N-alkylamino)carbonyl such as N-methylaminocarbonyl-N'-methylamino, N-ethylaminocarbonyl-N'-methylamino, N-ethylaminocarbonyl-N'-butylamino and the like, N-arylaminocarbonylamino such as N-phenylaminocarbonylamino, N-(3-methylphenyl)aminocarbonylamino, N-arylaminocarbonyl-N'-arylamino, such as N-phenylaminocarbonyl-N'-phenylamino, N-alkylaminocarbonyl-N'-arylamino such as N-methylaminocarbonyl-N'-phenylamino and the like, N-arylaminocarbonyl-N'-alkylamino such as N-phenylaminocarbonyl-N'-methylamino or N-methylaminocarbonyl-N'-phenylamino and the like, amino, alkyleneamino such as methyleneamino, 1,4-butanediylamino, 1,5-pentanediylamino, and the like, aryleneamino such as phenyleneamino and the like, N-alkylaminoalkyleneoxy such as N-methylaminomethyleneoxy, N-ethylaminomethyleneoxy and the like, N-arylaminoalkyleneoxy such as N-phenylaminomethyleneoxy, N-phenylaminoethyleneoxy and the like, oxyalkyleneaminoalkyleneoxy such as oxymethyleneaminomethyleneoxy, oxymethyleneaminoethyleneoxy and the like, alkyleneaminocarbonylamino such as methyleneaminocarbonylamino, ethyleneaminocarbonylamino and the like, oxyalkylene(N-alkyl)aminoalkyleneoxy such as oxymethylene(N-methyl)aminomethyleneoxy and the like, alkyleneaminoalkylene such as methyleneaminomethylene, ethyleneaminoethylene and the like, aryleneaminoarylene such as phenyleneaminophenylene and the like, aryleneaminoalkylene such as phenyleneaminomethylene and the like, alkyleneaminoarylene such as methyleneaminophenylene and the like.

Suitable C groups are 2,2,6,6-tetramethylpiperidin-4-yl, 1,2,2,6,6-pentamethylpiperidin-4-yl, 1-oxo-2,2,6,6-tetramethylpiperidin-4-yl and the like.

The biheterocyclic compositions can be added to organic compositions which are susceptible to ultraviolet degradation. Such compositions include, for example, polymeric compositions such as polyester fiber and molding compositions, such as polyethylene terephthalate, polymethylene terephthalate and the like; polyolefins such as, for example, high, medium and low density polyethylene, polypropylene, polybutene and the like; polyamides such as N-methoxymethyl polyhexamethylene adipamide and the like; polycarbonates; polyvinyl chlorides and copolymers; cellulose esters; acrylic/butadiene/styrene plastic; polyacrylics such as methyl methacrylate; polystyrene; gelatin; vinylidene chloride copolymers such as vinylidene chloride/vinyl acetate copolymers; ethylene vinyl acetate copolymers; cellulose ethers such as methyl cellulose; polyvinyl esters such as polyvinyl acetate; polyethylene oxide; polyvinyl acetals; polyformaldehydes; and polyurethanes. Such compositions also include natural and synthetic rubbers, such as polybutadiene, and unsaturated organic compositions such as oils and the like, as well as compositions containing such organic compositions.

The biheterocyclic compositions, as effective ultraviolet stabilizers or screening agents, are generally used in an amount of from 0.01% to 10%, by weight, based on the weight of the organic material to which they are added. While a detectable amount of ultraviolet screening and stabilization may be obtained with amounts less than 0.01%, this amount of stabilization or screening would be of little practical utility in a commercial application. Moreover, while amounts greater than 10%, by weight, provide effective ultraviolet stability and screening, such concentrations are undesirable because of cost and the deleterious effect which such concentrations may have on the mechanical properties of the organic composition in which the stabilizer is incorporated. Preferably, the stabilizer is used in an amount of from about 0.1 to about 3%, by weight. For example, an amount of 0.5%, by weight, of the stabilizer effectively stabilizes polytetramethylene terephthalate plastic compositions.

The ultraviolet stabilized organic compositions of the present invention may also contain other additives, pigments, colorants, stabilizers and the like. For example, polymeric compositions, such as polyolefins, may also contain and generally do contain other additives such as white or colored pigments or colorants, antioxidants, plasticizers, flow aids, processing aids, polymeric modifiers and the like.

These novel biheterocyclic ultraviolet stabilizers may be incorporated into organic compositions by melt-blending or may be added onto the surface of an organic plastic material prior to being molded into a suitable object. These materials can also be added to coatings and the like which can be applied to the surface of a molded object.

This invention will be further illustrated by the following examples although it will be understood that these examples are included merely for purposes of illustration and are not intended to limit the scope of the invention.

EXAMPLE 1

Preparation of 4-[2-(2-benzoxazoloxy)ethoxy]-2,2,6,6-tetramethylpiperidine (I). A mixture of 2-chlorobenzoxazole, 4-(2-hydroxyethoxy)-2,2,6,6-tetramethylpiperidine and K₂ CO₃ in 2-butanone was refluxed for ten hours. The hot mixture was filtered to remove K₂ CO₃. After removal of solvent, the product I was obtained by washing the residue with heptane.

This example hereinabove shows the B linking group as an oxyalkyleneoxy group. Other B linking groups can be provided as known in the art as for example:

1. an oxycarbonylalkyleneoxy by esterification of an acid or acid chloride with an alcohol or phenol in alkaline medium;

2. an oxycarbonyloxy by the reaction of phosgene with alcohol or phenol in alkaline medium;

3. an alkyleneoxy by the reaction of halide with alkali salt of alcohol or phenol;

4. an alkyleneoxyalkyleneoxy by the reaction of halide with alkali salt of alcohol or phenol;

5. a sulfinyldioxy by the reaction of thionyl chloride with alcohol or phenol in alkaline solution;

6. a thio by the reaction of a sodium sulfide with a halide;

7. an oxy(alkoxy)phosphinoxy by the reaction of a dichlorophosphite with phenol in the presence of a base;

8. alkyl(or aryl)oxyphosphinylidene by the reaction of a halophosphate with phenol or alcohol;

9. oxy(alkyl)phosphinyloxy by the reaction of a phosphonyl chloride with phenol or alcohol;

10. an N-alkyl or N-arylaminocarbonyl by the reaction of an acid chloride with an amine;

11. an N-alkyl or N-arylaminocarbonylalkoxy by the reaction of an acid chloride with an amine;

12. an N-alkyl or N-arylaminocarbonylamino by the reaction of phosgene with an amine;

13. an N-alkyl or N-arylaminoalkylene by the reaction of an alkyl halide with an amine;

14. an N-alkyl or N-arylaminoalkyleneoxy by the reaction of an oxyalkyl halide with an amine.

EXAMPLE 2

Preparation of 4-[2-(2-benzothiazoloxy)ethoxy]-2,2,6,6-tetramethylpiperidine (II).

II can be similarly prepared by the procedure of Example 1.

EXAMPLE 3

Preparation of 4-[2-(1-ethyl-2-benzimidazolyl)ethoxy]-2,2,6,6-tetramethylpiperidine (III).

III can be similarly prepared by the procedure of Example 1.

EXAMPLE 4

Preparation of 4-[2-(1-ethyl-2-indolyl)ethoxy]-2,2,6,6-tetramethylpiperidine (IV).

IV can be similarly prepared by the procedure of Example 1.

EXAMPLE 5

The ultraviolet stabilization provided by the biheterocyclic compounds of the present invention is shown for poly(tetramethylene terephthalate) in Table 1.

A dry mixture of the stabilizer and granulated poly(tetramethylene terephthalate) was extruded into 1/16-inch diameter rods, pelletized and injection molded into 21/2-×1/2-×1/16-inch flat bars; these flat bars were exposed to a 280-700 nm. mercury lamp source until a flatwise impact strength of less than 6 was obtained (initial values were all >17).

The test results are summarized in Table 1.

                  Table 1                                                          ______________________________________                                         Effectiveness of Ultraviolet Stabilizers in                                    Poly(tetramethylene terephthalate)                                             Compound   FWIS (Flatwise Impact Strength)                                     (0.5%)     Initial     300 hr.    500 hr.                                      ______________________________________                                         none       20           3          1                                           I          17          15         19                                           II         19          19         12                                           III        17          19         19                                           IV         17          16         11                                           ______________________________________                                    

These biheterocyclic compositions find particular utility as ultraviolet stabilizers in organic compositions requiring ultraviolet stability. Such compositions include polymeric compositions such as, for example, polyester fiber and molding compositions, poly-α-olefins, polyamides, acrylics, cellulose esters and the like, as well as molded or shaped articles, film and coatings formed from such materials and the like. Such compositions also include natural and synthetic rubbers, such as natural rubber, as well as organic materials such as oils, fats, and unsaturated organic materials and materials having such materials contained therein such as paints, varnishes, cosmetics and the like.

The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention. 

We claim:
 1. A composition of matter comprising biheterocyclic compounds having the formula:

    A--B--C

wherein A is a group having the formula: ##STR8## wherein X is a carbon atom or a nitrogen atom; Z is an oxygen atom, a sulfur atom, a nitrogen atom, or a nitrogen atom containing a hydrogen atom or a lower alkyl group containing 1 to 12 carbon atoms; R₁, R₂, R₃ and R₄ are hydrogen, lower alkyl, cyclohexyl, phenyl, lower alkyl phenyl, phenyl-substituted-phenyl, chloro, bromo, lower alkoxy, lower alkyl substituted amino, cyano, and the substituents R₁ and R₂, R₂ and R₃, and R₃ and R₄, combined with the carbon atoms to which they are attached, are joined lower alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R₁, R₂, R₃ and R₄ ; wherein B is a linking group connecting A and C and can be carbonyloxy, oxycarbonylalkyleneoxy, oxycarbonyl, alkyleneoxycarbonyloxy, oxyalkylenecarbonyl, oxycarbonyloxy, alkyleneoxy, oxyalkylene, alkyleneoxyalkyleneoxy, thio, thioalkyleneoxy, sulfinyldioxy, oxy(alkoxy)phosphinooxy, alkyloxyphosphinylidene, aryloxyphosphinylidene, oxy(alkyl)phosphinyloxy, aminocarbonyl, N-alkylaminocarbonyl, N-arylaminocarbonyl, aminocarbonylalkyleneoxy, N-alkylaminocarbonylalkyleneoxy, N-arylaminocarbonylalkyleneoxy, aminocarbonylamino, N-alkylaminocarbonylamino, N,N-dialkylaminocarbonyl, N,N-diarylaminocarbonyl, N-alkylaminoalkyleneoxy, N-arylaminoalkyleneoxy, oxyalkyleneoxy, oxyaryleneoxy, alkyleneaminoalkylene, aryleneaminoarylene, aryleneaminoalkylene and alkyleneaminoarylene; with the proviso that in the above definitions of B, alkyl indicates loweralkyl, alkylene indicates lower alkylene, alkoxy indicates lower alkoxy, aryl indicates phenyl, naphthyl or lower alkyl substituted phenyl or naphthyl and arylene indicates phenylene or naphthylene; and wherein C is a group having the formula ##STR9## R₅ and R₆ are each alkyl having 1-6 carbons; R₇ and R₈ are each alkyl having 1-6 carbons or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group; and R₉ is hydrogen, oxy, alkyl having 1 to 12 carbon atoms, β-methoxyethyl, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or lower alkyl substituted benzyl.
 2. A composition of matter according to claim 1 wherein X is a carbon atom.
 3. A composition of matter according to claim 1 wherein X is a nitrogen atom.
 4. A composition of matter according to claim 2 wherein Z is a nitrogen atom.
 5. A composition of matter according to claim 3 wherein Z is a sulfur atom.
 6. A composition of matter according to claim 3 wherein Z is a nitrogen atom.
 7. A composition of matter according to claim 3 wherein Z is a nitrogen atom containing hydrogen or a lower alkyl group containing 1 to 12 carbon atoms.
 8. A composition of matter according to claim 3 wherein Z is an oxygen atom.
 9. A composition of matter according to claim 8 having the formula: ##STR10## wherein E is a member selected from the group consisting of a branched or unbranched alkylene group containing 1 to 8 carbon atoms, carbonyl lower alkylene, lower alkylenecarbonyl;R₁, R₂, R₃ and R₄ are hydrogen, hydroxy, chloro, bromo, lower alkyl, cyclohexyl, phenyl, lower alkyl phenyl, lower alkoxy, amino, lower alkyl substituted amino, cyano, carboxy and the substituents R₁ and R₂, R₂ and R₃, R₃ and R₄, combined with the carbon atoms to which they are attached, are joined lower alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R₁, R₂, R₃ and R₄ ; R₅ and R₆ are each alkyl having 1-6 carbons; R₇ and R₈ are each alkyl having 1-6 carbons or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group; and R₉ is hydrogen, oxy, alkyl having 1 to 12 carbon atoms, β-methoxyethyl, alkenyl having 3 to 4 carbon atoms, propargyl, benzyl or lower alkyl substituted benzyl.
 10. A composition of matter according to claim 1 having the formula: ##STR11##
 11. A composition of matter according to claim 1 having the formula: ##STR12##
 12. A composition of matter according to claim 1 having the formula: ##STR13##
 13. A composition of matter according to claim 1 having the formula: ##STR14##
 14. An organic composition susceptible to ultraviolet light degradation stabilized against such degradation with a stabilizing amount of at least one biheterocyclic compound having the formula:

    A--B--C

wherein A is a group having the structure ##STR15## wherein X is a carbon atom or a nitrogen atom; Z is an oxygen atom, a sulfur atom, a nitrogen atom, or a nitrogen atom containing a hydrogen atom or a lower alkyl group containing 1 to 12 carbon atoms; R₁, R₂, R₃ and R₄ are hydrogen, lower alkyl, cyclohexyl, phenyl, lower alkyl phenyl, phenyl-substituted-phenyl, chloro, bromo, lower alkoxy, lower alkyl substituted amino, cyano, and the substituents R₁ and R₂, R₂ and R₃, and R₃ and R₄, combined with the carbon atoms to which they are attached, are joined lower alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R₁, R₂, R₃ and R₄ ; B is a linking group connecting A and C and can be alkylene, arylene, carbonyloxy, oxycarbonylalkyleneoxy, oxycarbonyl, alkyleneoxycarbonyloxy, oxyalkylenecarbonyl, oxycarbonyloxy, alkyleneoxy, oxyalkylene, alkyleneoxyalkyleneoxy, thio, thioalkyleneoxy, sulfinyldioxy, oxy(alkoxy)phosphinooxy, alkyloxyphosphinylidene, aryloxyphosphinylidene, oxy(alkyl)phosphinyloxy, aminocarbonyl, N-alkylaminocarbonyl, N-arylaminocarbonyl, aminocarbonylalkyleneoxy, N-alkylaminocarbonylalkyleneoxy, N-arylaminocarbonylalkyleneoxy, aminocarbonylamino, N-alkylaminocarbonylamino, N,N-dialkylaminocarbonyl, N,N-diarylaminocarbonyl, N-alkylaminoalkyleneoxy, N-arylaminoalkyleneoxy, oxyalkyleneoxy, oxyaryleneoxy, alkyleneaminoalkylene, aryleneaminoarylene, aryleneaminoalkylene and alkyleneaminoarylene; with the proviso that in the above definitions of B, alkyl indicates loweralkyl, alkylene indicates lower alkylene, alkoxy indicates lower alkoxy, aryl indicates phenyl, naphthyl or lower substituted phenyl or naphthyl and arylene indicates phenylene or naphthylene; and wherein C is a group having the formula ##STR16## R₅ and R₆ are each alkyl having 1-6 carbons; R₇ and R₈ are each alkyl having 1-6 carbons or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group; and R₉ is hydrogen, oxy, alkyl having 1 to 12 carbon atoms, β-methoxyethyl, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or lower alkyl substituted benzyl.
 15. An organic composition according to claim 14 wherein X of said biheterocyclic compound is a carbon atom.
 16. An organic composition according to claim 14 wherein X of said biheterocyclic compound is a nitrogen atom.
 17. An organic composition according to claim 15 wherein Z of said biheterocyclic compound is a nitrogen atom.
 18. An organic composition according to claim 16 wherein Z of said biheterocyclic compound is a sulfur atom.
 19. An organic composition according to claim 16 wherein Z of said biheterocyclic compound is a nitrogen atom.
 20. An organic composition according to claim 16 wherein Z of said biheterocyclic compound is a nitrogen atom containing hydrogen or a lower alkyl group containing 1 to 12 carbon atoms.
 21. An organic composition according to claim 16 wherein Z of said biheterocyclic compound is an oxygen atom.
 22. An organic composition according to claim 21 wherein said biheterocyclic compound has the formula: ##STR17## wherein E is a member selected from the group consisting of a branched or unbranched alkylene group containing 1 to 8 carbon atoms, carbonyl lower alkylene, lower alkylenecarbonyl;R₁, R₂, R₃ and R₄ are hydrogen, hydroxy, chloro, bromo, lower alkyl, cyclo lower alkyl, phenyl, naphthyl or lower alkylphenyl or naphthyl, lower alkoxy, amino, lower alkyl amino, cyano, carboxy and the substituents R₁ and R₂, R₂ and R₃, R₃ and R₄, combined with the carbon atoms to which they are attached, are joined lower alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R₁, R₂, R₃ and R₄ ; R₅ and R₆ are each alkyl having 1-6 carbons; R₇ and R₈ are each alkyl having 1-6 carbons or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group; and R₉ is hydrogen, oxy, alkyl having 1 to 12 carbon atoms, β-methoxyethyl, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or lower alkyl substituted benzyl.
 23. An organic composition according to claim 14 wherein said biheterocyclic compound has the formula: ##STR18##
 24. An organic composition according to claim 14 wherein said biheterocyclic compound has the formula: ##STR19##
 25. An organic composition according to claim 14 wherein said biheterocyclic compound has the formula: ##STR20##
 26. An organic composition according to claim 14 wherein said biheterocyclic compound has the formula: ##STR21## 